How to Play Casino War Online

Where These Rules Apply

The regulations quoted on this page are Pennsylvania's. Chapter 651a of 58 Pa. Code specifies this game for the physical tables Pennsylvania licenses, and it is quoted here because it is the clearest published specification of how the game is dealt and paid. It governs dealers, cards and chips at a physical table, which is not what an online version of the game runs on: an online table is specified by its operator and by whichever regulator licenses it, and its paytable and house rules can differ from the figures below.

The Rules in Brief

Casino War is one card each. The player's card is compared with the dealer's, suits are ignored, and the higher rank wins at 1 to 1. There is no hand to build and no draw to judge. Everything that distinguishes the casino version from the children's game happens when the two cards are equal.

The Tie

On a tie the player must choose between surrendering half the initial wager and ending the round, or matching the wager and going to war. If they go to war, Pennsylvania's table-game rule 58 Pa. Code § 651a.9 has the dealer remove three cards from the shoe face down without showing them, then deal one card to each warring player and one to the dealer, with the original cards left exposed. A higher war card returns the initial wager and pays the war wager at 1 to 1. A lower one loses both. And if the war cards tie as well, the initial wager is returned and the war wager is paid at 2 to 1.

The Rule That Keeps Getting Left Out

That 2-to-1 payout on a repeated tie is written into the payout section of Pennsylvania's regulations, and it is routinely missing from descriptions of the game — including descriptions that go on to quote a house edge. It matters twice over: it is a real payout a surrendering player forgoes, and it is one of the two variables that move Casino War's maths. The other is the deck count. Pennsylvania permits six or eight decks from a manual shoe, or 12 to 16 decks in two alternating batches behind an automated shuffling device, and the deck count moves how often a tie comes up: with one card already dealt, the chance the next card matches its rank is (4N-1)/(52N-1) on an N-deck shoe, which rises as decks are added rather than falling.

What Is Published, and What Is Not

No regulator, testing laboratory or supplier publishes a house edge for Casino War against a stated rule set. What is published is Light & Wonder's return figure for its own online Casino War, game ID 500392: 97.83%. No single percentage can stand for the game, because the rules a percentage would have to assume - the war-tie payout, the tie wager's price and the deck count - are all set table by table.

The Tie Side Bet

Alongside the main wager a player may place a Tie Wager, which wins if the deal results in a tie. Chapter 651a pays it at 10 to 1, which is one licensed answer among several: Pennsylvania's table-game rule 58 Pa. Code § 651b.2(a) lets an operator elect to offer the tie wager at 11 to 1 or at 12 to 1 instead, if that is what its filed Rules Submission says, so the price of this bet is one of the things to read off the table rather than assume. A player who goes to war may place another on the war deal. It is a separate bet settled on its own terms, and because a tie becomes slightly more likely as decks are added, its cost is a function of the shoe as well as of the payout.

Why It Is Worth Reading a Game's Own Rules

Casino War is a clear demonstration that a simple game is not the same as a game with a simple house edge. Two tables can both be called Casino War, deal from different numbers of decks, pay a war tie differently, and offer the same side bet at a different price. The published figure on a particular game's rules page is the only figure that describes that game.

The Object of the Game

Casino War is a single-card game. Each player receives one card and the dealer receives one card, and the higher rank wins. Suits do not matter. The whole of the house's margin sits in what happens when the two cards are equal.

How a Round Runs

1. A player places an Initial Wager, and may also place an optional Tie Wager.
2. One card is dealt to each player and one to the dealer.
3. If the player's card outranks the dealer's, the Initial Wager is paid 1 to 1 and any Tie Wager is lost.
4. If the player's card is lower, the Initial Wager and any Tie Wager are collected.
5. If the two cards are of equal rank, the player chooses between two options, and any Tie Wager wins at the price the table has filed — 10 to 1, 11 to 1 or 12 to 1.

The Tie, Which Is the Whole Game

On a tie the player must choose:

• Surrender. Half the Initial Wager is collected and half returned. The round ends.
• Go to war. The player places a War Wager equal to the Initial Wager. The dealer removes three cards from the shoe face down without showing them, then deals one card to each player who has gone to war and one to the dealer. The original cards stay exposed throughout.

On the war deal:

• If the player's war card is higher, the Initial Wager is returned and the War Wager is paid at 1 to 1.
• If the player's war card is lower, the Initial Wager, the War Wager and any Tie Wager are all collected.
• If the war cards tie, the Initial Wager is returned and the War Wager is paid at 2 to 1.

That last line is the rule most summaries of Casino War leave out. Under Pennsylvania's regulations a tie on the war deal pays double on the War Wager, so going to war is not simply doubling a stake for the same prize.

The Side Bet

The Tie Wager is a separate bet that the deal will produce a tie. Chapter 651a pays it at 10 to 1, and § 651b.2(a) lets an operator elect 11 to 1 or 12 to 1 instead, so the table's own rules settle which of the three applies. It may be placed alongside the Initial Wager, and a player who goes to war is offered the chance to place one on the war deal as well.

Decks and Equipment

Pennsylvania requires six or eight decks dealt from a manual shoe, or 12 to 16 decks split into two alternating batches where an automated shuffling device is used. Cards opened at a table are changed at least once every 24 hours. Deck count is one of the two things that moves Casino War's maths, so a game's own rules page is where it should be read.

One Decision, Once in a While

Casino War gives the player a single choice and only when the two cards tie: surrender half the Initial Wager, or match it and go to war. Everything else is dealt and settled without input. There is nothing to learn about card selection, no hand to play out, and no bet sizing that changes the price of the game.

What the Rules Say About That Choice

The two options are not symmetrical, and Pennsylvania's regulations are the place to see why. Surrendering costs half the Initial Wager with certainty. Going to war risks a second wager of the same size, and on the war deal a higher card returns the Initial Wager and pays the War Wager at 1 to 1, while a tie returns the Initial Wager and pays the War Wager at 2 to 1. The 2-to-1 payout on a repeated tie is real money that a surrender gives up, and it is the reason a description of the tie as 'doubling your wager without any potential of a bigger payout' is not accurate under these rules.

No regulator, testing laboratory or supplier publishes a house edge for either option, so neither can be called the cheaper one in percentage terms. What can be said from primary sources is that the comparison depends on the war-tie payout and on the deck count, both of which are set per table.

The Tie Wager

The optional Tie Wager wins only on an equal-rank deal, and Pennsylvania licenses more than one price for it: 10 to 1 under Chapter 651a, or 11 to 1 or 12 to 1 where an operator has elected one of those under § 651b.2(a). It is a separate bet with its own price, settled independently of the main hand, and its cost depends on how many decks are in the shoe — the more decks, the more often two equal ranks meet, since the match chance after the first card is (4N-1)/(52N-1) on an N-deck shoe. No published figure for it was found, so none is stated.

What Does Not Work

Each round is dealt from a shoe that the player never handles, from six to sixteen decks depending on the table, with the cards changed at least every 24 hours. A run of high or low cards does not change what the next card will be, so no staking pattern changes the cost of playing. Light & Wonder's own figure for its Casino War is a 97.83% return, which means the game is built to keep part of every amount staked; no sequence of the one available decision changes that.